We love taking our dogs out and letting them go a little further than the normal leash! Having the waste bags and the flashlight right on the device really helps me relax and enjoy the walk! One button Brake and Safety Lock System Press the button once to lock the belt at its current length.  Press the button once to unlock the belt and allow it to retract.   The button locks and unlocks.  You do not  hold the button in to keep the belt locked in place; you just click it once to lock and click it once to unlock. 3-in-1 = Bags, Light, and Leash Detachable Waste Bag Carrier  Attachment is SOLID! No waste bags swaying back and forth! Comes with 20 disposable bags Detachable 9 piece LED flashlight 9 LED Bulbs ​requires 3 AAA batteries - NOT included 16 FT tangle-free leash Collar attachment is metal